/*
 * Copyright (c) 2011-2012 Alexander Dubu
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * o  Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * o  Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * o  Neither the name Axil nor the names of its contributors may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package axil.stdlib.collection.function;

import axil.api.AxilObject;
import axil.api.extend.Environment;
import axil.api.extend.Function;
import axil.api.extend.Parameters;
import axil.api.extend.Source;
import axil.stdlib.collection.type.Arry;
import axil.stdlib.collection.type.Bag;
import axil.stdlib.collection.type.Dict;
import axil.stdlib.core.type.Nil;
import axil.stdlib.numbers.type.Int;
import axil.stdlib.text.type.Char;
import axil.stdlib.text.type.Str;

import static axil.framework.Functions.*;


/**
 * Given a collection, put the given object into the collection at the given
 * key/index point. A new collection containing the given object is returned.
 */
public class AtPut implements Function {
	/**
	 * Execute this function with the given arguments. The Axil compiler will
	 * ensure that the number of arguments passed to the function are valid.
	 * If this function fails during execution for any reason, then an exception
	 * is thrown.
	 */
	public AxilObject eval(Environment env, Parameters params, Source source) {
		AxilObject a = params.a();
		AxilObject b = params.b();
		if (b == Nil.object) {
			throw error(axil(), "no-nil-keys");
		}
		AxilObject value = params.c();
		if (a instanceof Arry) {
			Arry copy = ((Arry) a).cloned();
			int i = cast(Int.class, b).value() - 1;
			return copy.at(i, value).immute();
		}
		if (a instanceof Bag) {
			return ((Bag)a).put(value);
		}
		if (a instanceof Dict) {
			Dict d = ((Dict)a).cloned();
			return d.at(b, value).immute();
		}
		if (a instanceof Str) {
			StringBuilder s = new StringBuilder(a.toString());
			int i = cast(Int.class, b).value() - 1;
			if ((i < 0) || (i >= s.length())) {
				throw error(axil(), "index-out-of-bounds", nv("index", b));
			}
			char ch = cast(Char.class, value).value();
			s.setCharAt(i, ch);
			return Str.from(s.toString());
		}
		throw error(axil(), "wrong-object-type",
		            nv("function", "at-put"), nv("type", a.type()));
	}
}
